If XRP were the utility asset for world banking and cross border transfers I can guarantee you it uses way less energy than traditional banking. They've done plenty of scalability testing too with some fairly large banks. MoneyGram have done testing with them. The SBI, Santander, Canadian BoC, Partnered with AWS, TransferGo...there's more but you can go and check for yourself
XRP for one doesn't using PoW anyway so involves no mining incentive. It's mostly done via Trusted Validator Nodes and based on consensus to approve transactions. It doesn't discriminate between other currencies (digital or FIAT). At present it can handle 1500tps at a fee of $0.00001. To put that in comparison to other crypto...ETH can currently do 10tps and BTC only 4-5tps.
But you know, don't get sucked into the mantra that BTC and ETH are the only crypto around by those who haven't checked out much else
You reds x